Originally Posted by Alec300SD

Haven't done this before, but the following should work:

Warm the end of the nylon hose in a mug of boiled water.
Place the metal fitting in a socket, put both in the oven.
Heat the oven to about 300 degreees or so.

Remove the heated parts with curved pliers.
Push the warmed up end of the nylon tubing onto the warmed up barbed fitting.